Bosch 15282 Oxygen Sensor, OE Fitment (Buick, Cadillac, Chevrolet, GMC, Hummer, Saab) Designed to determine the oxygen content of the exhaust gas Improves fuel economy and lowers emission Includes three OE heated wires Advanced ceramic technology for consistent performance and long life Features a Platinum Power-Grid that produces a precise voltage signal for the engine ECU